Albert Viljam Hagelin (24 April 1881 – 25 May 1946) was a Norwegian businessman and opera singer who became the Minister of Domestic Affairs in the Quisling regime, the puppet government headed by Vidkun Quisling during Germany's World War II occupation of Norway.

Hagelin's mother, Gerd Anna Hedvig Eleonore Meyer (1857–1926), was of Danish-Jewish descent, and her father was also a goldsmith; as a widow, she ran a private hotel in Bergen after the family's jewelry business was closed down.

[2] In the spring of 1939, Hagelin tried to obtain German money for the NS newspaper Fritt Folk.

However, Hagelin managed to establish ties with other German leaders and came into contact with Grand Admiral Erich Raeder and the NSDAP's chief ideologist Alfred Rosenberg.

[3] With Quisling's coup on 9 April 1940, Hagelin was appointed Minister of Trade and Supply, and thus gained a place in the innermost NS circles.

In the autumn of 1940, Hagelin was appointed head of the newly established Ministry of the Interior, as part of Josef Terboven's commissary cabinet.

Among other things, he was against the arrest and deportation of the Norwegian Jews and was in favor of the administration of Jewish affairs being placed under the Ministry of the Interior.

Terboven eventually made it clear that Norway's position would be stronger if Hagelin disappeared.